Supply voltage generating circuit and semiconductor memory device using same

摘要

A semiconductor memory device with a supply voltage generating circuit which can fine-tune its output voltages according to the frequency of a given clock signal. A reference voltage generator produces a plurality of different reference voltages. A clock signal receiver accepts a clock signal and supplies it to a period measurement unit for measurement of the cycle period of the given clock signal. A selector selects one of the produced reference voltages according to the clock period measured by the period measurement unit. A supply voltage generator produces a supply voltage corresponding to the selected reference voltage.